Check the power at the outlet; compressors require a 120V / 15Amp unloaded circuit to start properly. Check the tank pressure gauge; if the tank is already filled with compressed air, the pressure switch (on / off switch) will not activate because the pressure is above the recycle level. Check the pressure switch (on / off switch). To turn on most units, the red button is pulled up for on, and pushed down for off. To find a Factory Service Center in your area, please click here.